Dual SIM holder is your solution if you want to get rid of the tension of buying 2 mobile phones because you got 2 SIM or getting the back and battery of your mobile time to time to change to another SIM. This is the simplest and cheapest solution that allows you to connect two SIM cards to your card slot.
It has many drawbacks too like it does not really work with both cards simultaneously. At a time only one SIM is active and the user has to turn off the mobile and back on to change to another SIM. Another kind of Dual SIM holder is there though in which SIM service is activated giving users the ability to switch to another SIM without turning off the mobile. Another big problem is that due to its bigger size it may not fit in some handsets. Hope they will make something else without these flaws someday.
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